异丁腈
Firstly,conventional free radical polymerization of methyl methacrylate(MMA)initiated by 2,2'-azobis(isobutyronitrile)(AIBN)was carried out in the presence of polyfunctional chain transfer agent,pentaerythritol-tetrakis (3-mercaptopropinate)(PETMP). At appropriate monomer conversion, two-arm star-shaped s-PMMA having two residual thiol groups at the chain center was obtained.
首先,以偶氮二异丁腈为引发剂,四(3-巯基丙酸季戊四醇四酯)(PETMP)为链转移剂进行甲基丙烯酸甲酯(MMA)的普通自由基聚合,在一定转化率下,得到了含有两个残余巯基的聚甲基丙烯酸甲酯大分子链转移剂(s-PMMA)。